'use client';

import { useState } from 'react';
import { X, AlertTriangle, Link2, ChevronRight, Bug as BugIcon, Trash2 } from 'lucide-react';
import { TestCaseStatusBadge } from './TestCaseStatusBadge';
import { BugStatusBadge } from '@/components/bug/BugStatusBadge';
import { useTestCaseStore } from '@/stores/useTestCaseStore';
import { useBugStore } from '@/stores/useBugStore';
import { useRequirementStore } from '@/stores/useRequirementStore';
import { TC_ALLOWED_TRANSITIONS, TEST_CASE_STATUS_LABEL } from '@/lib/test-case';
import { BUG_SEVERITY_LABEL, BUG_SEVERITY_COLOR } from '@/lib/bug';
import type { TestCaseStatus } from '@/lib/test-case';

interface Props {
  testCaseId: string;
  onClose: () => void;
  onCreateBug?: (testCaseId: string) => void;
}

export function TestCaseDetailDrawer({ testCaseId, onClose, onCreateBug }: Props) {
  const { testCases, changeStatus, deleteTestCase } = useTestCaseStore();
  const { bugs } = useBugStore();
  const { requirements } = useRequirementStore();

  const tc = testCases.find((c) => c.id === testCaseId);
  if (!tc) return null;

  const requirement = requirements.find((r) => r.id === tc.requirementId);
  const relatedBugs = bugs.filter((b) => b.testCaseId === tc.id);
  const nextStatuses = TC_ALLOWED_TRANSITIONS[tc.status];

  const [failReason, setFailReason] = useState('');
  const [blockReason, setBlockReason] = useState('');
  const [showFailInput, setShowFailInput] = useState(false);
  const [showBlockInput, setShowBlockInput] = useState(false);

  const handleTransition = (to: TestCaseStatus) => {
    if (to === 'failed') { setShowFailInput(true); return; }
    if (to === 'blocked') { setShowBlockInput(true); return; }
    changeStatus(tc.id, to);
  };

  const confirmFail = () => {
    changeStatus(tc.id, 'failed', { failReason: failReason.trim() || undefined });
    setShowFailInput(false);
    setFailReason('');
  };

  const confirmBlock = () => {
    changeStatus(tc.id, 'blocked', { blockReason: blockReason.trim() || undefined });
    setShowBlockInput(false);
    setBlockReason('');
  };

  return (
    <div className="fixed inset-0 z-50 flex justify-end" onClick={onClose}>
      <div className="w-full max-w-md h-full bg-[var(--bg)] border-l border-[var(--line)] shadow-[var(--shadow-lg)] flex flex-col" onClick={(e) => e.stopPropagation()}>
        <div className="flex items-center justify-between h-14 px-5 border-b border-[var(--line)] bg-[var(--bg-card)] shrink-0">
          <div className="flex items-center gap-2">
            <span className="text-[12px] font-mono text-[var(--ink-muted)]">{tc.caseNo}</span>
            <span className="text-[14px] font-semibold text-[var(--ink)] truncate max-w-[240px]">{tc.title}</span>
          </div>
          <div className="flex items-center gap-1">
            <button onClick={() => { if (relatedBugs.length > 0) { alert('该用例有关联 Bug，无法删除'); return; } if (confirm('确定删除此测试用例？')) { deleteTestCase(tc.id); onClose(); } }} className="p-1.5 rounded-lg hover:bg-red-50 text-[var(--ink-muted)] hover:text-red-500" title="删除"><Trash2 className="h-4 w-4" /></button>
            <button onClick={onClose} className="p-1.5 rounded-lg hover:bg-[var(--bg-subtle)]"><X className="h-4 w-4 text-[var(--ink-muted)]" /></button>
          </div>
        </div>

        <div className="flex-1 overflow-y-auto p-4 space-y-3">
          {/* 关联需求 */}
          {requirement && (
            <div className="rounded-xl border border-[var(--line)] bg-[var(--bg-card)] p-3">
              <div className="text-[10px] text-[var(--ink-muted)] uppercase tracking-wide mb-1.5">关联需求</div>
              <div className="flex items-center gap-2">
                <Link2 className="h-3.5 w-3.5 text-[var(--accent)]" />
                <span className="text-[11px] font-mono text-[var(--ink-muted)]">{requirement.code}</span>
                <span className="text-[13px] text-[var(--ink)]">{requirement.title}</span>
              </div>
            </div>
          )}

          {/* 状态 & 操作 */}
          <div className="rounded-xl border border-[var(--line)] bg-[var(--bg-card)] p-4 space-y-3">
            <div className="text-[10px] text-[var(--ink-muted)] uppercase tracking-wide">状态 & 操作</div>
            <div className="flex items-center gap-3">
              <TestCaseStatusBadge status={tc.status} />
              {tc.executedAt && <span className="text-[11px] text-[var(--ink-muted)]">执行于 {tc.executedAt}</span>}
            </div>

            {nextStatuses.length > 0 && !showFailInput && !showBlockInput && (
              <div className="flex items-center gap-2 pt-1">
                <ChevronRight className="h-3.5 w-3.5 text-[var(--ink-muted)]" />
                {nextStatuses.map((s) => (
                  <button key={s} onClick={() => handleTransition(s)} className={`h-8 px-4 rounded-lg text-[12px] font-medium transition-colors ${s === 'passed' ? 'bg-emerald-500 text-white hover:bg-emerald-600' : s === 'failed' ? 'bg-red-500 text-white hover:bg-red-600' : 'bg-[var(--accent)] text-white hover:bg-[var(--accent-hover)]'}`}>
                    {TEST_CASE_STATUS_LABEL[s]}
                  </button>
                ))}
              </div>
            )}

            {showFailInput && (
              <div className="flex gap-2 pt-1">
                <input value={failReason} onChange={(e) => setFailReason(e.target.value)} onKeyDown={(e) => { if (e.key === 'Enter') confirmFail(); }} placeholder="失败原因（可选）" className="flex-1 h-8 rounded-lg border border-[var(--line)] px-3 text-[12px] focus:border-red-400 focus:outline-none" autoFocus />
                <button onClick={confirmFail} className="h-8 px-3 rounded-lg text-[11px] font-medium bg-red-500 text-white">确认失败</button>
                <button onClick={() => setShowFailInput(false)} className="h-8 px-2 text-[11px] text-[var(--ink-muted)]">取消</button>
              </div>
            )}

            {showBlockInput && (
              <div className="flex gap-2 pt-1">
                <input value={blockReason} onChange={(e) => setBlockReason(e.target.value)} onKeyDown={(e) => { if (e.key === 'Enter') confirmBlock(); }} placeholder="阻塞原因（可选）" className="flex-1 h-8 rounded-lg border border-[var(--line)] px-3 text-[12px] focus:border-orange-400 focus:outline-none" autoFocus />
                <button onClick={confirmBlock} className="h-8 px-3 rounded-lg text-[11px] font-medium bg-orange-500 text-white">确认阻塞</button>
                <button onClick={() => setShowBlockInput(false)} className="h-8 px-2 text-[11px] text-[var(--ink-muted)]">取消</button>
              </div>
            )}

            {tc.failReason && <div className="text-[12px] text-red-600 bg-red-50 rounded-lg px-3 py-2"><AlertTriangle className="h-3 w-3 inline mr-1" />失败原因：{tc.failReason}</div>}
            {tc.blockReason && <div className="text-[12px] text-orange-600 bg-orange-50 rounded-lg px-3 py-2"><AlertTriangle className="h-3 w-3 inline mr-1" />阻塞原因：{tc.blockReason}</div>}
          </div>

          {/* 基本信息 */}
          <div className="rounded-xl border border-[var(--line)] bg-[var(--bg-card)] p-4">
            <div className="text-[10px] text-[var(--ink-muted)] uppercase tracking-wide mb-3">基本信息</div>
            <div className="grid grid-cols-2 gap-y-3 gap-x-4 text-[12px]">
              <div><span className="text-[var(--ink-muted)]">优先级：</span><span className="text-[var(--ink)] font-medium">{tc.priority}</span></div>
              <div><span className="text-[var(--ink-muted)]">负责人：</span><span className="text-[var(--ink)] font-medium">{tc.assigneeId || '-'}</span></div>
              <div><span className="text-[var(--ink-muted)]">创建人：</span><span className="text-[var(--ink)]">{tc.createdBy}</span></div>
              <div><span className="text-[var(--ink-muted)]">创建日期：</span><span className="text-[var(--ink)]">{tc.createdAt.slice(0, 10)}</span></div>
            </div>
          </div>

          {/* 用例描述 */}
          {tc.description && (
            <div className="rounded-xl border border-[var(--line)] bg-[var(--bg-card)] p-4">
              <div className="text-[10px] text-[var(--ink-muted)] uppercase tracking-wide mb-2">测试步骤 & 预期</div>
              <p className="text-[12px] text-[var(--ink-soft)] leading-relaxed whitespace-pre-wrap">{tc.description}</p>
            </div>
          )}

          {/* 关联 Bug + 提BUG按钮 */}
          <div className="rounded-xl border border-[var(--line)] bg-[var(--bg-card)] p-4">
            <div className="flex items-center justify-between mb-2">
              <div className="text-[10px] text-[var(--ink-muted)] uppercase tracking-wide">关联 Bug ({relatedBugs.length})</div>
              {tc.status === 'failed' && onCreateBug && (
                <button onClick={() => onCreateBug(tc.id)} className="flex items-center gap-1 h-7 px-3 rounded-lg text-[11px] font-medium bg-red-500 text-white hover:bg-red-600">
                  <BugIcon className="h-3 w-3" />提 BUG
                </button>
              )}
            </div>
            {relatedBugs.length === 0 ? (
              <p className="text-[12px] text-[var(--ink-muted)]">暂无关联 Bug</p>
            ) : (
              <div className="space-y-2">
                {relatedBugs.map((bug) => (
                  <div key={bug.id} className="flex items-center gap-2 text-[12px] px-2.5 py-1.5 rounded-lg bg-[var(--bg-subtle)]">
                    <span className="font-mono text-[var(--ink-muted)]">{bug.bugNo}</span>
                    <span className="text-[var(--ink)] flex-1 truncate">{bug.title}</span>
                    <span className={`text-[10px] px-1.5 py-0.5 rounded ${BUG_SEVERITY_COLOR[bug.severity]}`}>{BUG_SEVERITY_LABEL[bug.severity]}</span>
                    <BugStatusBadge status={bug.status} />
                  </div>
                ))}
              </div>
            )}
          </div>
        </div>
      </div>
    </div>
  );
}